PSTSWM SP3-200 Communication Protocol Performance

Performance Studies using

PSTSWM

IBM SP3-200 Protocol Performance

(distributed LT experiment A1 / exchange sum algorithm)

Date/Person: November 28, 1999 / P. Worley
Platform: IBM SP3 at Oak Ridge National Laboratory (morgan.ccs.ornl.gov):
     62 2-way Winterhawk I SMP nodes (200 MHz POWER3 with 4MB L2 cache, equivalent to RS/6000 Model 260)
Environment: AIX 4.3.2.2;   PSSP 3.1
Code Version: 6.6.4
Compilation Options: mpxlf -O3 -qarch=auto -qtune=auto -qcache=auto
Link Options: -bmaxdata:0x70000000
Environment Variables: export MP_SHARED_MEMORY="yes"
Math Library: ESSL
Communication Library: MPI over the switch using user space for internode communication
MPI using shared memory for intranode communication
Parallel Algorithm: exchsum
Number of Timesteps: 12
Results:

1x16 Processors / Problem T21L2
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  4.3393e-02   0.25   0.24   0.52 
Three Fastest
Protocols
1st2nd3rd
  c4   a5   a4 
       Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  1   3   13 

1x32 Processors / Problem T42L1
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  8.8559e-02   0.25   0.26   0.56 
Three Fastest
Protocols
1st2nd3rd
  a4   a5   c4 
       Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  2   3   12 

1x8 Processors / Problem T42L2
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  1.3536e-01   0.12   0.15   0.25 
Three Fastest
Protocols
1st2nd3rd
  c4   a5   a4 
       Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  2   6   24 

1x16 Processors / Problem T85L1
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  2.8693e-01   0.15   0.15   0.28 
Three Fastest
Protocols
1st2nd3rd
  a4   a1   a5 
       Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  3   4   20 

1x32 Processors / Problem T85L2
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  6.0835e-01   0.22   0.23   0.46 
Three Fastest
Protocols
1st2nd3rd
  a1   a5   a4 
       Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  2   3   17 

1x8 Processors / Problem T85L4
Runtime Statistics
min(mean-min)/min(median-min)/min(max-min)/min
  1.2710e+00   0.09   0.07   0.28 
Three Fastest
Protocols
1st2nd3rd
  a4   a1   a5 
       Number of Proctocols With
Runtimes Within X% of Min
1%5%25%
  3   6   24 

Patrick H. Worley / ( worleyph@ornl.gov)
Last Modified Monday, 15-Jul-2002 10:15:12 EDT.